Microstructural stability of nanocrystalline Li Co O 2 in lithium thin-film batteries under high-voltage cycling

The microstructural stability of nanocrystalline Li Co O 2 cathodes in rechargeable thin-film batteries after high-voltage cycling was investigated by transmission electron microscopy. It was found that besides the trigonal- Li Co O 2 phase, there are two other phases of Li x Co O 2 , spinel and H 1...

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Published in:Applied physics letters 2007-06, Vol.90 (26), p.263102-263102-3
Main Authors: Li, Chiung-Nan, Yang, Jenn-Ming, Krasnov, Victor, Arias, Jeff, Nieh, Kai-Wei
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Summary:The microstructural stability of nanocrystalline Li Co O 2 cathodes in rechargeable thin-film batteries after high-voltage cycling was investigated by transmission electron microscopy. It was found that besides the trigonal- Li Co O 2 phase, there are two other phases of Li x Co O 2 , spinel and H 1 - 3 , that form inside the nanocrystalline cathode after electrochemical cycling (charge cutoff voltages ≧ 4.5 V ). The formation of the aforementioned secondary phases in the cathode material is irreversible and leads to capacity loss in lithium thin-film batteries.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2751609